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Motorola MTH500 Service Manual
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Motorola MTH500 Service Manual

Tetra portable radio r1:380-400 mhz (pt811f)
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See also: Basic Service Manual
MTH500
TETRA Portable Radio
R1:380-400 MHz (PT811F)
Detailed Service Manual
Part Number: 6802963C70
@6802963C70@
Printed on recycled paper. Environmentally friendly cover and spiral bound. European Publications Department .
68P02963C70-O, Issued: 05.02.

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Summary of Contents for Motorola MTH500

  • Page 1 MTH500 TETRA Portable Radio R1:380-400 MHz (PT811F) Detailed Service Manual Part Number: 6802963C70 @6802963C70@ Printed on recycled paper. Environmentally friendly cover and spiral bound. European Publications Department . 68P02963C70-O, Issued: 05.02.

  • Page 2: Scope Of This Manual

    • National Council on Radiation Protection and without the express written permission of Motorola. Furthermore, Measurements (NCRP) of the United States, the purchase of Motorola products shall not be deemed to grant Report 86, 1986 either directly or by implication, estoppel, or otherwise, any •...
  • Page 3 ON. RF exposure guidelines. If you do not use a Motorola • not carry the handset in the breast pocket. approved body-worn accessory and are not using the •...
  • Page 4 “Intrinsically Safe” (for example, Factory Mutual, CSA, Motorola a/s UL, or CENELEC Approved). Do not remove, install, or charge batteries in such areas. Sparks in a potentially Midtager 20...

  • Page 5: Table Of Contents

    MTH500 Portable Radio Model Information ........
  • Page 6 Contents Mixer ................. 2-11 IF Filter .
  • Page 7 Disassembling and Reassembling the MTH500 Unit ........
  • Page 8 MTH500 Components List ........
  • Page 9 Contents Appendix 2 Test Equipment, Service Aids & Tools ............... A2-1 Appendix 3 Self Check Error/Fail Code Tables .
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  • Page 11: Mth500 Portable Radio Model Information

    Foreword MTH500 Portable Radio Model Information This manual applies to the following MTH500, 1W, Hand-Held Portable Radio Models: Black H39PCN6TZ5AZ, 380-400MHz Blue H39PCN6TZ5AR, 380-400MHz MODEL NUMBERING SYSTEM Typical Model Numbering: M Position: 1 1 1 2 Position 1 - Type of Unit...

  • Page 12: Mth500 Model Specifications

    Foreword MTH500 Model Specifications GENERAL RECEIVER TRANSMITTER p/4DQPSK ETSI ETS 300 394-1 Receiver Type: Class A and B Modulation Type: Type Number: Frequency Range: R1:380-400 MHz R1:380-400 MHz: PT811F Temperature Range for Transceiver: Channel Spacing: 25 kHz RF Power 1Watt Operating: -20°C to +60°C...

  • Page 13: Mth500 Accessories

    Foreword MTH500 Accessories Kit Number MTH500 Model Description Batteries FTN6030A Extended battery, 1100mAh, LiIon, Black (with battery door) FTN6037A Extended battery, 1100mAh, LiIon, Blue (with battery door) FTN6031A Standard battery, 800mAh, LiIon, Black (with battery door) FTN6038A Standard battery, 800mAh, LiIon, Blue (with battery door)
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  • Page 15: Overview

    Overview General MTH500 To achieve a high spectrum efficiency, the uses digital modulation technology and sophisticated voice-compression algorithm. The voice of the per- son speaking into the microphone is converted into a digital bit stream consisting of zeros (0) and ones (1). This stream is then modulated into a radio-frequency (RF) signal, which is transmitted over the air to another radio.

  • Page 16: Voice Compression Technology

    Voice is converted into a digital bit stream by sampling the voice at high rate and converting the samples into numbers, which are represented by bits. Voice compression reduces the number of bits per second while maintaining the MTH500 voice at an acceptable quality level. The uses a coding technique called ACELP (Algebraic Code Excited Linear Prediction).

  • Page 17: Receiver Path Description

    Overview The transmitter path consists of a novel cartesian feedback loop that contains the forward and loop feedback paths. The forward path includes the low noise ODCT (Offset Direct Conversion Transmitter), Balun, Attenuator, and Power Amplifier. The loop feedback path includes the directional coupler, attenuator, and LNODCT (Low Noise Offset Direct Conversion Transmitter) ASIC.
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  • Page 19: Theory Of Operation

    Theory of Operation Section Introduction This section provides a block diagram overview of the main Digital/RF Board. This is supplemented by the detailed block diagram and detailed circuit descrip- tion. Block Diagram Overview The main Digital/RF Block contains the following four sections (see Figure 1). An overview of these four sections is provided in the following paragraphs: •...

  • Page 20: Receiver Section

    Theory of Operation Antenna Battery Block Antenna Switch Main Board Transmitter Digital Block Synthesizer Receiever Audio KeyPad Figure 1 General Block Diagram Receiver Section The receiver section includes the following main components: • Antenna Switch • Limiter • Front Filter •...

  • Page 21: Transmitter Section

    Transmitter Section The transmitter circuitry includes a linear class AB Power Amplifier (PA) for the linear modulation of the MTH500. It also includes a novel cartesian feedback loop to enhance its transmitter linearity and reduced splattering power into adjacent channels.

  • Page 22: Frequency Generating Section

    Theory of Operation Frequency Generating Section The frequency generating section contains the following components: • REF. Oscillator - TCXO • Main Synthesizer - consists of the WPIC’s PLL and the Main Voltage Con- trolled Oscillator (VCO). • 2nd Local Oscillator (LO) VCO together with the LMX Dual Synthesizer. •...

  • Page 23: Block Diagrams Descriptions

    Theory of Operation Block Diagrams Descriptions The block diagrams descriptions cover Receiver Path, Transmitter Path, Digital Section, and Frequency Generation Section. Receiver Path The received signal (see Figure 2) from the antenna is directed by the Antenna Switch to the Front Filter.

  • Page 24: Transmitter Path

    Theory of Operation data is sent for further processing to the Digital Signal Processor (DSP) (part of RedCap2) over the Synchronous Serial Interface (SSI) data links. The DSP performs: the demodulation, Forward Error Correction (FEC) and other correction algorithms for overcoming channel errors, and the GCAP decoder pro- cedure for digital speech data decompression.

  • Page 25: Digital Mode Of Operation

    Theory of Operation Digital Mode of Operation The digital section (see Figure 4) contains the radio's Redcap Risk-processor with its external memory and DSP, including its memory, within. GCAP III includes switching regulator and linear regulators, audio preamplifiers, CODEC 13-bit, 8- channel 8-bit A/D Converter, Regulators, Audio Amplifier.

  • Page 26: Frequency Generating Section

    Theory of Operation Frequency Generating Section The frequency generating section contains the following components (see Figure 5): • REF. Oscillator - TCXO • Main Synthesizer - consists of the WPIC’s PLL and the Main Voltage Con- trolled Oscillator (VCO). • 2nd Local Oscillator (LO) VCO together with the LMX Dual Synthesizer.

  • Page 27: Main Synthesizer

    Theory of Operation All frequencies originate from the REF. oscillator -TCXO. This is a digital tem- perature compensated crystal oscillator producing an accurate and stable 16.8 MHz reference frequency. The 16.8 MHz reference frequency is divided in the WPIC and in the Dual Synthesizer to produce required reference frequency for the other synthesizers.

  • Page 28: Detailed Circuit Description

    Theory of Operation Detailed Circuit Description Receiver Path, Detailed Circuit Description See Figure 6. Front Filter IL=2.5dB Baseband Filters (DSP) Baseband Amplifiers GCAP Figure 6 Receiver Path Circuit Diagram Antenna Switch The signal coming from the antenna is routed to the receiver section via the har- monic filter, which is comprised of L890 and C1012.

  • Page 29: Limiter

    Theory of Operation frequency by approximately 38dB. The attenuation of wanted signal is typically 0.7dB. Limiter The limiter (D500) function is to prevent entering of signal with power higher then 30dBm, which may damage the receiver front-end. Front Filter The signal arrived from the limiter is flowing via the front filter (FL500) and rout- ed to the Low Noise Amplifier (LNA) (U500) via C576.

  • Page 30: If Filter

    Theory of Operation and C984), enters the Mixer at pin 3. The LO power at the LO mixer input is - 2dBm. The 2.7V DC is supplied by switch Q500 to pin.4. The mixer conversion Loss is 7dB. An impedance matching net is placed between the mixer and the IF filter (FL502). It consists of L512, C525, C531, C524, L504 and C539.

  • Page 31: Transmitter Path, Detailed Circuit Description

    Theory of Operation Transmitter Path, Detailed Circuit Description See Figure 7. Main VCO Image Att. Mixer Filter -0.1dB Coupler Offset Dual Synthesizer Power Amp. Att. Balun- (FET) Filter 37 ± 2 LNODCT I/Q Split -5dB Isolator -3dB Att. -10dB WPIC Ant.

  • Page 32: Lo Line-Up

    Theory of Operation low-level differential reference clock signal (pins B11, TCLCK; C10, TCLCKB) to the LNODCT. It also sends a differential signal (pins A11, TSLOT; A10, TSLOTB) that marks the beginning and the end of each transmission time slot of the REDCAP2 (whenever a TXE signal (pin H8 TXE) is received from the REDCAP2).

  • Page 33: Rf Power Amplifier

    Theory of Operation Another function of the BALUN-Filter is to attenuate the image frequencies and other unwanted out-of-band spurs present in the output signal. The insertion loss of the BALUN-Filter is 3dB. The output signal from the BALUN-Filter is applied to the RF PA through -1.8dB attenuator (R836, R833, R834).

  • Page 34: Harmonic Filter

    Theory of Operation Harmonic Filter From the antenna switch the signal is routed to a one section of LC filter, consist- ing of the coil L890 and capacitors C1010, C1011 and C1012. The filter is re- quired to attenuate the harmonics of the amplifying stages at the transmission path, and the Local Oscillator leakage at the receiver path.

  • Page 35: Digital Section, Detailed Circuit Description

    Theory of Operation Digital Section, Detailed Circuit Description See Figure 8. Graphic Display Control SPIB RF Section SPIA Power Supplies REDCAP2 4 MB flash memory Keypad 1MB SRAM Vibracall Radio Off GCAP3 ESSI SPIB Reset USB/8-RS232 USB_PWR OPT B+ BAT_FDBK CE Accessory Conn.

  • Page 36: Sram Memory

    Theory of Operation The Flash also stores the Radio CodePlug (Customer related information) such as telephone numbers, addresses, etc. SRAM Memory This 512 x 16 Static Ram is used for Data storage. Serial Peripheral Interface (SPI) The RedCap2 uses the SPI protocol (Serial Peripheral Interface) to communicate with RF IC's (WPIC, ODCT, Synthesizer/LMX), GCAP3 IC and the display driv- The RF IC's are connected to SPIA module, while GCAP3 and the display are connected via SPIB module.
  • Page 37 Theory of Operation Encr yption PR OM 2Kx24 DSP Peripheral Accelerator PRAM 40Kx24 DSP_IRQ STDB Baseband CODEC YROM 0Kx16 SRDB Ser ial P ort XYA(16) SFSB(2) YRAM 15Kx16 XYRW,XYSEL,XYSTB SCKB(2) Counter Core XYD(16)/TXA/RXA/GI STD A Audio SRD A CODEC XROM 0Kx16 Ser ial Port SFSA(2) Viterbi...

  • Page 38: Dc Power Distribution

    Theory of Operation DC Power Distribution (See Figure 10). V1 Linear Regulator V1 is a programmable linear regulator. It is programmed using the Redcap SPI bus from 0.975V to 3.0V in 8 steps. This regulator is active during Power Reset (POR) and its initial value is 0.95V.

  • Page 39: Switcher #2 (Boost Mode Converter)

    Theory of Operation Switcher #2 (Boost Mode Converter) Switcher #2 is a selectable step up switching regulator. It is selectable using the Redcap SPI bus to 5.6/5.0/3.35 Volt and Power down mode. The switcher is sup- plied from B+ and it is active whenever the radio is turned ON. The switcher is inherently in 5.6V mode at POR.
  • Page 40 USBDETEC T VCO& Buf f er : 10mA BL_SNKGCAP III 2nd LOVCO 1.875V ON VREF2 Keypad/Display Not Used 2.775V @ 100mA Backlight 0.9V OFF Display 1.3V @ 200mA LEDR/LEDG R_G_LED GCAP III Figure 10 MTH500 DC Distribution 2 - 22 68P02963C70-O...

  • Page 41: Rs232, Sb9600

    Theory of Operation RS232, SB9600 The REDCAP processor (RCE) uses the three serial protocols: UART and SB9600 to communicate with external devices via the bottom connector of the unit. There is no external hardware for switching from one protocol to another be- cause the REDCAP2 handles the switching and line multiplexing functions inter- nally.
  • Page 42 Theory of Operation adjusts the path gain according to the setting of the volume control, and the mul- tiplexer routes the audio to the active receive path. When the internal speaker is active, the audio is fed to A2, double-ended audio power amplifier. Otherwise, the audio is fed to A1, output amplifier, that drives the Internal Earpiece or the PHF earpiece.

  • Page 43: Frequency Generating Section Detailed Circuit Description

    Theory of Operation Frequency Generating Section Detailed Circuit Description See Figure 12. This section describes the generating circuits that supply all the required frequen- cies for the required transmitter and receiver functions. These circuits are de- scribed as follows: • REF.

  • Page 44: Ref. Oscillator - Tcxo

    Theory of Operation REF. Oscillator - TCXO The TCXO is the reference frequency source for all the radio synthesizers. The output of the oscillator is a 16.8 MHz stable temperature compensated reference clock. This signal is present at pin 3 of the TCXO. This oscillator’s centre frequen- cy is programmed (256 steps of approximately 0.1 ppm).

  • Page 45: Lmx - Dual Synthesizer

    Theory of Operation LMX - Dual Synthesizer The LMX233XL is an integrated dual frequency synthesizer that includes prescal- ers. It is used with the second LO at the RF section and with the Offset VCO at the IF section. The LMX uses the 16.8 MHz from the TCXO for both synthesizers and divides the TCXO frequency as follows: •...

  • Page 46: Display And Keypad Description

    Theory of Operation Display and Keypad Description Display The LCD (Liquid Crystal Display) Module is a Graphic Display based upon the KS0741TB-01 display driver. It consist of LCD Holographic Glass, LED backlight and a 22 pin flex cable con- nected to the Keypad board. The Communication to the RedCap2 IC is performed using a SPI protocol (Serial Peripheral Interface).

  • Page 47: Backlight And Leds

    Theory of Operation Backlight and LEDs Backlight The keypad backlight consists of 10 green LEDs. There are two more LEDs in the LCD module that are connected in parallel to the keypad LEDs. Top LEDs There are one Green and one Red LEDs, both located on the LCD board. These LEDs are used as indicators to the radio operation.

  • Page 48: Mode Select (Option1 And Option2)

    Theory of Operation Mode Select (OPTION1 and OPTION2) Logic levels applied to the OPTION1, OPTION2, USB POWER, and AUDIO IN lines are used to select the CE Bus mode. The modes will be set as follows: MODE OPTION_1 OPTION_2 USB_PWR AUDIO_IN NORMAL (no accessory) USB Accessory/Computer...
  • Page 49 Theory of Operation Power/ RS232 RS232/ Signal Name (Short Form) Default Dumb States wire) DUMB_SEL0/STDA/DSR DSEL0 STDA (DSEL0) Option 1 (OPT1) UPLink UPLink OPT1 OPT1 OPT1 Option 2 (OPT2) DNLink OPT2 OPT2 OPT2 DNLink Audio Out On/Off (AUDIO_OUT) AUDIO AUDIO AUDIO AUDIO AUDIO...
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  • Page 51: Troubleshooting

    CPS programme. Test Procedures This section explains the procedures required to troubleshoot a MTH500 radio. The digital tests should be performed using the GoNoGo PATS test and TetraCom SW. To use the TetraCom you must go to test mode by using the command <Test Enter>.

  • Page 52: Troubleshooting Flowcharts

    Troubleshooting Troubleshooting Flowcharts Use the following flowcharts to troubleshoot the radio. These flowcharts contain procedures using TetraCom SW application, GoNoGo PATS test and factory test modes for troubleshoot- ing radios having digital, receiver, transmitter, or frequency generation test failures. DMO Troubleshooting Charts The troubleshooting flowcharts for the DMO mode are same like the TMO mode.

  • Page 53: Digital Troubleshooting

    Troubleshooting Digital Troubleshooting Digital Analysis Test Use this test for troubleshooting the main board. After completing the setup procedure, power on the unit. Does the power supply show Replace the current of 0.05 to Main Board. 0.1A? Is the power supply Use the GoNoGo current correct PATS test for...

  • Page 54: Digital Analysis Test (Cont.)

    Troubleshooting Digital Analysis Test (Cont.) Use the GoNoGo P AT S test for “Flash_up ” (U403) Did the The Flash (U403) unit pass the is defective. “Flash_up ” test? Y e s Note: Test the backlight This test will be perform by TetraCom SW application. by turning it on Command: <BackL EN/DIS>.
  • Page 55 Troubleshooting Digital Analysis Test (Cont.) Check the LCD Visually check J2 Does text appear connector on LCD? on LCD board Check 22 Is J2 OK? pin Flex Contacts via 22 Replace J2 on Replace Flex pin Flex OK? LCD board Replace LCD 3 - 5 68P02963C70-O...

  • Page 56: Digital Analysis Test (Cont.)

    Troubleshooting Digital Analysis Test (Cont.) Note: This test will be perform by TetraCom SW application. Test the vibrator Command: <VIBR EN/DIS>. Check the Power Supply Did the V1, 1.875V on C611 vibrator when “VIBR EN” TetraCom vibrate? command has been entered Check 1.875V on D001 Is the The Main Board...

  • Page 57: Dc Distribution (V2_2.775V) Test

    Troubleshooting DC Distribution (V2_2.775V) Test Use this test on a unit with the following symptoms: no power, no V2_2.775V, V1_1.875V, V3_2.775V, VREF1_2.775V, VREF2_2.775V. Note: The following are the DC power distribution voltages with their correct values and ap- propriate location to check the voltages: •...

  • Page 58: Dc Distribution (V2_2.775V) Test (Cont.)

    Troubleshooting DC Distribution (V2_2.775V) Test (Cont.) Check battery contact P1-4 for 3.6 Vdc Check the bench Is the voltage OK? Power Supply Check junction of F600 and Vr601 pin 2 for 3.6Vdc (Fused_B+) Check junction of F600 and VR601 Is the voltage OK? for 0 (ground) Replace Fuse Check C640...
  • Page 59 Troubleshooting DC Distribution (V2_2.775V) Test (Cont.) Check Filt_B+ at C640 or C652 for 3.6 Vdc Is the voltage OK? Replace U600 (GCAP III) Check TP600 for 32 kHz clock with 2.775V amplitude Replace Are frequency U600 (GCAP III) and amplitude OK? Check TP603 for the Reset high Is Reset...

  • Page 60: Dc Distribution (V2_2.775V) Test (Cont.)

    Troubleshooting DC Distribution (V2_2.775V) Test (Cont.) Check C610, C613, C657 for 2.775 Vdc (V2_2.775V) Is the voltage OK? Replace U600 (GCAP III) Refer to other DC Distribution Test Flowcharts 3 - 10 68P02963C70-O...

  • Page 61: Dc Distribution (Swb+) Test

    Troubleshooting DC Distribution (SWB+) Test Use this test on a unit with the following symptoms: no SWB+. Note: This test will be performed using TetraCom SW application commands <SWB EN/Dis>. TetraCom command Check U104 pin 6 “SWB EN” for 3.6 Vdc TetraCom Is the voltage Is the voltage OK?

  • Page 62: Dc Distribution (V4_2.775V) Test

    Troubleshooting DC Distribution (V4_2.775V) Test Use this test on a unit with the following symptoms: no V4_2.775V. Check Q602 pin 2 for 2.775 Vdc Check traces to the RX section, Is the voltage OK? Freq. Gen. section, and TX section Replace E200 Is the voltage OK? Check Q602 pin 3...

  • Page 63: Dc Distribution (V3_2.775V/Pwm2_1.8V) Test

    Troubleshooting DC Distribution (V3_2.775V/PWM2_1.8V) Test Use this test on a unit with the following symptoms: no V3_2.775V, no PWM2_1.8V. Check C609, C658, C659 for 2.7 Vdc (V3_2.775 V) Refer to the Is the voltage OK? DC distribution (V2_2.775 V) Test flowchart Check C624 for 1.88 Vdc (PWM2_1.8V)
  • Page 64 Troubleshooting DC Distribution (V5_RF/PWM1/VSIM1 _5.6V) Test and (VSIM1) Test Use these tests on a unit with the following symptoms: no V5_RF, no PWM1_5.6V, or no VSIM1_5.6V. PWMI Check C615, C651 VSIMI for 5 Vdc Check VSIMI C652 for 3.0 Vdc Check E201 Is the voltage OK? for opening...

  • Page 65: Transmitter Troubleshooting

    Troubleshooting Transmitter Troubleshooting Standby Current Troubleshooting This test should be carried out only after the successful completion of the previous tests. Note: The standby upper current limit is 100mA and lower limit is 4mA Measure the radio standby current by using P ATS station Check if there are shorts on the board: - check if RF P A U809 is shorted to the ground - check voltage regulator VR601, R640, current...

  • Page 66: Open Loop Power Test

    Troubleshooting Open Loop Power Test This test should be carried out only after the successful completion of the previous tests. Measure the Open Loop power by using PATS Check the bias voltages on pins 8,16 of RF PA U809. Check resistors R827 and R828, regulators Q807 and Q911, replace parts Is the...

  • Page 67: Open Loop Power Test (Cont.)

    Troubleshooting Open Loop Power Test (Cont.) Check Tx line-up from LNODCT U803 output till RF PA U809 input, replace Is power < -4 dBm? damaged parts. Perform the Open loop power test again. Perform the following: 1. Visually check all components and solder connections around LN ODCT. 2.
  • Page 68 Troubleshooting Open Loop Power Test (Cont.) Measure the RF power at the input of LO Driver (Q808) and input of I/Q splitter U801. Calculate the LO Driver Gain. Check for 2.5Vdc during Tx slot, if voltage is OK, check L813, if L813 is OK replace Q808.

  • Page 69: Wpic Test

    Troubleshooting WPIC Test This test should be started in accordance to Open Loop Power test. Perform the following: 1. Set the unit to the Open loop test at a frequency of 390MHz. TetraCom Commands: 2. Read the value of WPIC 1 9 register by using TetraCom. It has 8 b its. WPIC 1 9 Change the hexadecimal value of WPIC 1 9 t o switch the 5-th bit from 0 to 1.

  • Page 70: Closed Loop Power Test

    Troubleshooting Closed Loop Power Test This test should be carried out only after the successful completion of the previous tests. Tune the radio on PATS. Is the radio close loop output power <28dBm or >31 dBm? Check the elements: coupler U806, R815, R818, R825, R826, C817.

  • Page 71: Transmitter Current Consumption Test

    Troubleshooting Transmitter Current Consumption Test This test should be carried out only after the successful completion of the previous tests. Start TX current test. Is TX current > 2.2A (average TX current?) 1. Measure RF PA bias voltages on pins 8 and 16 of U809.

  • Page 72: Receiver Troubleshooting

    Troubleshooting Receiver Troubleshooting Check Front Gain, using a R F probe on C536, Frequency 109.65MHz Check with all power Check second LO . Input s/Output s o f Ant. SW ., -16dBm<Power<-10dBm Is the Front Filter (Fl500), LN A Ye s Freq.=219.3MHz gain below (U500), Second Filter (Fl501),...

  • Page 73: Synthesizer Troubleshooting

    Troubleshooting Synthesizer Troubleshooting Use this test on a unit with the following symptom: no Tx or Rx TetraCom Commands: Using a 50-ohm probe on the spectrum analyzer,check the LO MAIN_VCO ON output at the buffer output at WPIC 3 1 c0 NOW R927 and R944.

  • Page 74: Synthesizer Troubleshooting (Cont.)

    Troubleshooting Synthesizer Troubleshooting (Cont.) Check for the following: 2.4Vdc on R934 and on R923. Possible VCO problem: Confirm that the resonator tab Check for opens or is prperly soldered. shorts in the VCO circuit. Confirm that the Varicap is in the right direction.

  • Page 75: Second Lo Vco Test

    Troubleshooting Second LO VCO Test TetraCom Commands: Chek for feedback Check DC supply for the VCO: Perform the following: problem: 1.Check for SF_OUT on C902, 1.Remove the 2nd_LO shield. 1.check soldering of R939,R906. WPIC 3 9 1b NOW 2.Set the Unit to continuous C262,R951,C970.

  • Page 76: Offset Vco Test

    Troubleshooting Offset VCO Test 3 - 26 68P02963C70-O...

  • Page 77: Audio Troubleshooting (External Mic To External Out)

    Troubleshooting Audio Troubleshooting (External Mic to External Out) Set the audio input to the external mic to 1.02KHz @ 44mV RMS. Test sequence is controlled by TetraCom commands to the external mic-to-external out loopback. Start AUDIO_LOOPBACK (1) Connect a scope or DVM to the following points and measure ac levels in Vrms.
  • Page 78 Troubleshooting This page left blank intentionally 3 - 28 68P02963C70-O...

  • Page 79: Programming The Radio

    Programming the Radio Programming The Radio Verify that the radio is turned off. Run the Customer Programming Software (CPS) on your computer. Codeplug Programming On the menu bar, click “File” “Open”. Browse for the required Codeplug file and open the file. The CodePlug window appears on the screen.

  • Page 80: Application Programming

    Programming the Radio NOTE: The Codeplug is now being written into the radio. A progress bar is displayed on the computer screen showing the writing status. The following display is shown on the radio screen: Diag. SW Ver. 01.01 HW ID Code: XXX Flash: TE28F320C3BA Command WRITE REQ.
  • Page 81 Programming the Radio NOTE: The application is now being written into the radio. A progress bar is displayed on the computer screen showing the writing status. The following display is shown on the radio screen: Diag. SW Ver. 01.01 HW ID Code: XXX Flash: TE28F320C3BA Command WRITE REQ.
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  • Page 83: Maintenance

    Maintenance Preventive Maintenance This portable radio does not require a scheduled preventive maintenance program. However, periodic visual inspection is recommended. Inspection Inspect the radio’s external surfaces. A detailed inspection of interior circuitry is not needed or recommended. Cleaning The following procedures describe the recommended cleaning agents and methods to be used when cleaning the external and internal surfaces of the radio.

  • Page 84: Safe Handling Of Cmos Devices

    All power must be turned off in a system before printed circuit boards containing CMOS devices are inserted, removed, or soldered. Disassembling and Reassembling the MTH500 Unit Mechanical checks and self tests should be performed on the unit at the basic level of service.

  • Page 85: Protecting Static-Sensitive Devices

    • Ground the working surface of your service bench. If possible, use the Motorola Static Protection Assembly (part #0180386A82) to ground your service bench. This assembly contains a wrist strap, two ground cords, a table mat, and a floor mat.

  • Page 86: Removing And Installing The Antenna

    Maintenance Removing and Installing the Antenna The antenna must be removed each time the back housing is removed. Recommended tools: no tools are required To remove the antenna from the unit: (See Figure 13) • Unscrew the antenna counter clockwise until it is detached from the handset. To install the antenna in the unit: •...

  • Page 87: To Remove The Battery

    Maintenance Press the battery door release button, slide the door towards the bottom of the unit and lift it up from the unit. Figure 14 Battery Door Removal To remove the battery: (See Figure 15) Press the battery fastening bridge toward the upper side of the unit. Simultaneously, using other hand, release the battery from its chamber.

  • Page 88: To Install The Battery

    Maintenance To install the battery: Locate the battery so that the lower part (coloured silver) is touching the lower wall of the battery chamber. Carefully press the battery down until it snaps into location. To install the battery door: Position the door on the unit over the battery so that the door release button is just above the battery fastening bridge.

  • Page 89: Installing The Back Housing

    Glue a new oval label over the holes of the two upper screws and a new tamper evident label (*only available to Motorola Services Centres) on the holes of the two center screws.

  • Page 90: Removing And Installing The Vibrator

    Maintenance Removing and Installing the Vibrator Recommended tools: mini flat-tip screwdriver Removing the vibrator: (See Figure 17) Remove the back housing, refer to “Removing and Installing the Back Housing”. Turn the back housing up side down and, using the screwdriver, remove the vibrator from its chamber inside the back housing.

  • Page 91: Removing And Installing The Main Board

    Maintenance Removing and Installing the Main Board Recommended tools: no tools are required Removing the main board from the unit: (See Figure 18) Remove the back housing, refer to “Removing and Installing the Back Housing”. Gently lift the main board, I/O connector side at the bottom of the board first, and re- move it from the unit.

  • Page 92: Removing And Installing The Keypad And Lcd Boards

    Maintenance Main Board PHF Cover I/O Connector Rubber Seal Figure 18 Main Board Removal and Installation Removing and Installing the Keypad and LCD Boards Recommended tools: mini flat-tip screwdriver Removing the keypad and LCD boards from the unit: (See Figure 19) Remove the back housing, refer to “Removing and Installing the Back Housing”.

  • Page 93: Installing The Keypad And Lcd Boards

    Maintenance Installing the keypad and LCD boards: Place the keypad and LCD boards on the work area so that the ZIF connectors are fac- ing up. CAUTION: Care must be taken when installing the keypad and LCD boards on the chassis. Failure to comply may result in tear of the flat cable between the two boards.

  • Page 94: Removing And Installing The Lcd Module Assembly

    Maintenance LCD Board LCD Board Release Slot Flat Cable Chassis Assembly Board-to-Board Connector ZIF Connectors Keypad Board Figure 19 Keypad and LCD Boards Removal and Installation Removing and Installing the LCD Module Assembly Recommended tools: no tools are required To remove the LCD module assembly from the unit: (See Figure 20) Remove the LCD board, refer to “Removing and Installing the Keypad and LCD Boards”...

  • Page 95: To Install The Lcd Module Assembly

    Maintenance To install the LCD module assembly: NOTE: Do not touch the LCD module assembly in the active viewing area; fingerprints on this surface cannot be easily removed. Locate the LCD module above the LCD board so that the two guide pins are aligned with the holes in the LCD board.

  • Page 96: Removing And Installing The Keypad

    Maintenance Removing and Installing the Keypad Recommended tools: no tools are required Removing the keypad: (See Figure 21) Remove the chassis assembly, refer to “Removing the keypad and LCD boards from the unit:”, steps 1 through 3. Remove the keypad from the unit. Installing the keypad: Install the keypad inside the front housing.

  • Page 97: Removing And Installing The Microphone

    Maintenance Removing and Installing the Microphone Recommended tools: no tools are required Removing the microphone: (See Figure 22) Remove the chassis assembly, refer to “Removing the keypad and LCD boards from the unit:”, steps 1 through 3. Remove the microphone. Installing the microphone: Insert a microphone into location.
  • Page 98 Maintenance Install the chassis assembly, refer to “Installing the keypad and LCD boards:”, steps 1 and 2. Earphone Acoustic Safety Rubber Front Housing Microphone Figure 22 Microphone and Earphone Removal and Installation 5 - 16 68P02963C70-O...

  • Page 99: Mth500 Components List

    Maintenance MTH500 Unit - Exploded View MTH500 components are listed in the “MTH500 Components List”. The first column marked with an # sign provides you with the call out numbers of the components as marked in Figure 23 and Figure 24.
  • Page 100 Maintenance 6 (X6) Figure 23 Exploded View 5 - 18 68P02963C70-O...
  • Page 101 Maintenance Figure 24 Exploded View of Chassis Assembly 5 - 19 68P02963C70-O...
  • Page 102 Maintenance 5 - 20 68P02963C70-O...

  • Page 103: Component Board Layouts

    MTH500 Detailed Service Manual - COMPONENT BOARD LAYOUTS Component Board Layouts 6 - 1 68P02963C70-O...
  • Page 104 MTH500 Detailed Service Manual - COMPONENT BOARD LAYOUTS This page intentionally left blank 6 - 2 68P02963C70-O...
  • Page 105 MTH500 Detailed Service Manual - COMPONENT BOARD LAYOUTS Keypad Board (FCN9090A) - Sides 1 and 2 8487639U01_P1 8487639U01_P1 SHOWN FROM SIDE 2 SHOWN FROM SIDE 1 79B02964C12-O 79B02964C11-O 79B02964C14-O 79B02964C13-O 6 - 3 68P02963C70-O...
  • Page 106 MTH500 Detailed Service Manual - COMPONENT BOARD LAYOUTS LCD Board (FCN9797A) - Side 1 and 2 8486097U01_P1 8486097U01_P1 79B02962C47-O SHOWN FROM SIDE 1 79B02962C46-O SHOWN FROM SIDE 2 79B02962C49-O 79B02962C48-O 6 - 4 68P02963C70-O...
  • Page 107 MTH500 Detailed Service Manual - COMPONENT BOARD LAYOUTS Main Board (FLF9011A) - Side 1 8488996U01_P1 SH901 SH900 R906 C953 C902 R921 E901 C909 TP914 TP814 C938 SH912 TP602 R937 Q903 R600 Q905 Q910 R924 TP601 TP405 SH003 TP911 TP811 TP001...
  • Page 108 MTH500 Detailed Service Manual - COMPONENT BOARD LAYOUTS Main Board (FLF9011A) - Side 2 8488996U01_P1 TP501 TP502 SH500 TP002 R966 C1049 L520 TP500 TP503 SH502 C554 C500 C518 C534 FL502 C535 R405 M501 C530 L519 C552 R401 C526 C510 C577...

  • Page 109: Schematic Diagrams And Parts Lists

    MTH500 Detailed Service Manual - Schematic Diagrams and Parts Lists Schematic Diagrams and Parts Lists 6 - 7 68P02963C70-O...
  • Page 110 SCHEMATIC DIAGRAMS - MTH500 Keypad Board (FCN9090A) MTH500 Keypad Board (FCN9090A) BACKLIGHT+ BLM11B601S ROW0 40 pin Main To Keypad conn SOFT KEY SOFT KEY DOWN MODE SEND/END LEFT RIGHT P1-19 10.n 180.p BACKLIGHT+ P1-21 ROW1 BACKLIGHT- RIGHT P1-25 ROW3 FLTR_EZAST33A...
  • Page 111 MTH500 Detailed Service Manual - MTH500 Keypad Board (FCN9090A) Component Parts MTH500 Keypad Board (FCN9090A) Component Parts When ordering component parts, the part number should be included. CAPACITORS CONNECTOR and INDUCTORS RESISTORS Ref # Part # Description Ref # Part #...
  • Page 112 SCHEMATIC DIAGRAMS - MTH500 LCD Board (FCN9797A) MTH500 LCD Board (FCN9797A) ROW4 BACKLIGHT+ VOL DOWN COL2 B1 1 BACKLIGHT+ FLEX to Keypad Board B2 2 P1-11 BACKLIGHT+ VOL UP P1-10 B1 1 BACKLIGHT- COL4 4 A2 B2 2 GREEN P1-17...
  • Page 113 MTH500 Detailed Service Manual - MTH500 LCD Board (FCN9797A) Component Parts MTH500 LCD Board (FCN9797A) Component Parts When ordering component parts, the part number should be included. CAPACITORS RECEPTOR RESISTORS Ref # Part # Description Ref # Part # Description...
  • Page 114 SCHEMATIC DIAGRAMS - MTH500 MAIN Board (FLF9011A) MTH500 MAIN Board (FLF9011A) VREF1_2.775V VREF1_2.775V RF_TEMP RF_TEMP DIGITAL ANT_EN ANT_EN V4_2.775V V4_2.775V_RF 5V_RF 5V_RF V3_2.775V V3_2.775 SYNT_CS_ SYNTH_CS RX_ACQ RX_ACQ TETRA_MAIN_VCO_ON TETRA_MAIN_VCO_ON WPIC_FSYNC WPIC_SSI_FSYNCH WPIC_OSC_EN WPIC_OSC_EN 16.8_MHz_CLK 16.8_OR13_MHz_CLK RAW_B+_RF RAW_B+_RF PA_Bias PA_BIAS...
  • Page 115 MTH500 Detailed Service Manual - MTH500 Main RF Block MTH500 Main RF Block SH912 TP934 U810 PLATED_HOLE5_2X7_6 PLATED_HOLE5_2X7_6 SHIELD Digital Test Point Shield TP805 CHTSTP L931 V4_2.775V_RF TP806 C1046 C200 C201 CHTSTP 47.0U 270.p 100.n E201 VALUE 5V_RF TP825 TP815...
  • Page 116 SCHEMATIC DIAGRAMS - MTH500 Transmitter Block (Sheet 1 of 2) ) MTH500 Transmitter Block (Sheet 1 of 2) ) L1T0 2.775V_RF LO_Driver_EN 2.5V_TX offset_vco 2.5V_TX Q805 SH802 2.5V_TX SHIELD R964 Q800 E806 BLM11B601S L811 C821 C856 ODCT Bottom Shield C828...
  • Page 117 MTH500 Detailed Service Manual - MTH500 Transmitter Block (Sheet 2 of 2) MTH500 Transmitter Block (Sheet 2 of 2) 2.775V_RF RAW_B+_RF RAW_B+_RF Q806 RAW_B+_RF C897 C898 C701 C702 C703 33.p 270.p 100.u 100.u 100.u E801 VCNTO FM60R E809 ANT_EN BLM11B601S...
  • Page 118 SCHEMATIC DIAGRAMS - MTH500 Receiver Block (Sheet 1 of 2) MTH500 Receiver Block (Sheet 1 of 2) CPGITR ADAPT PRSCIN 2.775V_RF C513 E501 L505 C522 should be 75n BLM10B601SDP 100.p 68.n TETRA_RX_LO 2.775V_RF L508 C551 C512 E500 R943 L500 56.n 270.p...
  • Page 119 MTH500 Detailed Service Manual - MTH500 Receiver Block (Sheet 2 of 2) MTH500 Receiver Block (Sheet 2 of 2) Tetra RX Mixer + 2nd LO Enable TETRA_2nd_LO_Enable RX_2nd_LO WPIC1(1:8) 2.775V_WPIC TCLK 5V_RF+ TCLKB TSLOT C504 TSLOTB R504 100.n OUTIB C508...
  • Page 120 SCHEMATIC DIAGRAMS - MTH500 Frequency Block Tetra Main VCO (Sheet 1 of 2) MTH500 Frequency Block Tetra Main VCO (Sheet 1 of 2) 5V_RF+ SF_OUT 2.775V_RF 5V_RF+ SF_OUT Q907 2.775V_RF TETRA Main VCO TETRA_MAIN_VCO_ON SF_OUT R934 R923 C904 C901 R931 270.p...
  • Page 121 MTH500 Detailed Service Manual - MTH500 Frequency Generation Block, Offset VCO (Sheet 2 of 2) MTH500 Frequency Generation Block, Offset VCO (Sheet 2 of 2) 2.775V_RF 5V_RF+ offset_vco_En SF_OUT C879 0.01UF C883 100.n C968 C966 C967 C954 270.p 270.p R907...
  • Page 122 SCHEMATIC DIAGRAMS - MTH500 Main Digital Block (Sheet 1 of 2) MTH500 Main Digital Block (Sheet 1 of 2) PHF_GND P15-8 P15-16 ON/OFF R015 DATA P15-38 R016 P15-39 CLOCK PHF_MIC P15-10 MIC- P15-4 MIC+ P15-6 P15-21 Backlight- E007 GRN_LED P15-20...
  • Page 123 MTH500 Detailed Service Manual - MTH500 Main Digital Block (Sheet 2 of 2) MTH500 Main Digital Block (Sheet 2 of 2) HW_ID = 301 for Freda R1 V3_2.775V VTS_2.3V VTS_2.3V VTS_2.3V E008 R013 R014 FM60R C048 BATTERY R001 R009 R011 4.7K...
  • Page 124 SCHEMATIC DIAGRAMS - MTH500 Audio & DC Block (Sheet 1 of 2) MTH500 Audio & DC Block (Sheet 1 of 2) MOBPORTB PWM Filter EXT_B+ Q600 PWM2_1.8V PWM1_5.6V L600 4.7UH L602 FUSED_B+ CHARGE R600 CR600 F600 47.0u 0.24 L601 3.6 VOLTS...
  • Page 125 MTH500 Detailed Service Manual - MTH500 Audio & DC Block (Sheet 2 of 2) MTH500 Audio & DC Block (Sheet 2 of 2) DC Power Supply Distribution RAW_B+ - 3.6V nominal - RF PA, TX Pre-drivers, ODCT Up-mixer FILT_B+ - RAW_B+ thru ferrite bead with bypass caps V1_2.775V...
  • Page 126 SCHEMATIC DIAGRAMS - MTH500 REDCAP 2 Block (Sheet 1 of 2) MTH500 REDCAP 2 Block (Sheet 1 of 2) SIM_CARD SIM_BUS(5:1) MCU_DE SIM_POWER TP401 SIM_RESET R401 RESET_OUT SIM_DATA SIM_CLOCK DSP_STD goes to GCAPIII_RX WPIC Serial Port STD Pin 83 GCAP3_RX...
  • Page 127 MTH500 Detailed Service Manual - MTH500 REDCAP 2 Block (Sheet 2 of 2) MTH500 REDCAP 2 Block (Sheet 2 of 2) V3_2.775V Bypass Caps for REDCAP V3_2.775V_FLTR E400 PWM2 C414 C420 PWM2_1.8V 180p C429 PWM2_1.8V_FLTR 100n E401 VCC TRUTH TABLE...
  • Page 128 SCHEMATIC DIAGRAMS - MTH500 Accessory Connector Block MTH500 Accessory Connector Block Battery Feedback/Charger ID BATT_FDBK R107 V3_2.775V 100. D101 C107 180.p Q100 SI3443DV R101 E101 External Power EXT_B+ R111 BLM21P300S 10.K C120 V3_2.775V BATT_FDBK_AD C105 100n SWB+ FOR CE Bus 180.p...
  • Page 129 MTH500 Detailed Service Manual - MTH500 (FLF9011A) Component Parts (for reference only) MTH500 (FLF9011A) Component Parts (for reference only) When ordering component parts, the part number should be included. If the correct numbers cannot be located, call Motorola Parts Identification. CAPACITORS...
  • Page 130 SCHEMATIC DIAGRAMS - MTH500 (FLF9011A) Component Parts (for reference only) CAPACITORS Ref # Part # Description Ref # Part # Description Ref # Part # Description Ref # Part # Description Ref # Part # Description C849 2113743N11 2.4pF C909-910...
  • Page 131 MTH500 Detailed Service Manual - MTH500 (FLF9011A) Component Parts (for reference only) FILTERS TRANSISTORS Ref # Part # Description Ref # Part # Description Ref # Part # Description Ref # Part # Description Ref # Part # Description FL500...
  • Page 132 SCHEMATIC DIAGRAMS - MTH500 (FLF9011A) Component Parts (for reference only) RESISTORS (Continued) MISCELLANEOUS Ref # Part # Description Ref # Part # Description Ref # Part # Description Ref # Part # Description Ref # Part # Description R118 0662057M74...
  • Page 133 MTH500 Detailed Service Manual - MTH500 Flex CD MTH500 Flex CD J1-1 J2-22 J1-2 J2-21 J1-3 J2-20 J1-4 J2-19 J1-5 J2-18 J1-6 J2-17 J1-7 J2-16 J1-8 J2-15 J1-9 J2-14 J1-10 J2-13 J1-11 J2-12 J1-12 J2-11 J1-13 J2-10 J1-14 J2-9 J1-15...
  • Page 134 SCHEMATIC DIAGRAMS - MTH500 Flex CD This page left blank intentionally 6 - 32 68P02963C70-O...

  • Page 135: Appendix 1 Replacement

    EMEA Radio Support Depots are level 3 service partners. The depots are capable of performing repairs down to component level where retuning is required. Con- tact your local CGISS office for information. Motorola European Radio Support Centre ERSC Phone: +49 6128 702618 Heinrich Hertz Strasse 1 D-65232 Taunusstein...

  • Page 136: Latin America Region

    1-847-538-8194 (Fax) Some replacement parts, spare parts, and/or product information can be ordered directly. If a complete Motorola part number is assigned to the part, it is available from Motorola Radio After market and Accessory Division (AAD). If no part number is assigned, the part is not normally available from Motorola.
  • Page 137 Replacement Parts and Kits Radio Replacement Parts List Part/Kit Number MTH500 Model Description 0186163T07 Front Housing Assembly (Black) 0186163T08 Front Housing Assembly (Blue) 0186630T01 Keypad Assembly 0186396T04 Back Housing Assembly (Black) 0186396T05 Back Housing Assembly (Blue) 8586381J03 Antenna 380-400 MHz (R1)
  • Page 138 Replacement Parts and Kits Accessories Replacement Parts List Kit Number MTH500 Model Description Batteries FTN6030A Extended battery, 1100mAh, LiIon, Black (with battery door) FTN6037A Extended battery, 1100mAh, LiIon, Blue (with battery door) FTN6031A Standard battery, 800mAh, LiIon, Black (with battery door)
  • Page 139 Replacement Parts and Kits Recommended Programming Equipment Name Part Number MTH500 CPS PMVN4065B Data Cable FKN4897A Service Replacement Kit Matrix (1) Sales Model Service Description Description Tanapa MTH500 Black FUF1208AS MTH500 Black 380-400 MHz S/T R1 CLEAR PT811F FUF1210AS MTH500 Black...
  • Page 140 Replacement Parts and Kits 68P02963C70-O...
  • Page 141 Replacement Parts and Kits 68P02963C70-O...
  • Page 142 Replacement Parts and Kits 68P02963C70-O...

  • Page 143: Appendix 2 Test Equipment, Service Aids

    Appendix 2 Test Equipment, Service Aids & Tools The table below lists the special test equipment required for servicing MTH500 radios. Name Part Number Anritsu Digital Signal Generator MG3660A Power Meter HP437B Power Supply HP6032A Universal Multimeter HP3457A RF Probe...
  • Page 144 Test Equipment, Service Aids & Tools THIS PAGE INTENTIONALLY LEFT BLANK A2 - 2 68P02963C70-O...

  • Page 145: Appendix 3 Self Check

    This appendix describes the possible self check error codes for the MTH500 Portable Radios. Self Check Error Codes Table 1. is the possible self check error (non fatal) codes for the MTH500 Portable Radios. No corrective action is required. Table 1.
  • Page 146 Connector Pin Functions Message Cause Fail00804 CP - Unknown format Fail00805 CP - Invalid pointer Fail00806 CP - Invalid path Fail00807 CP - Invalid handler Fail00808 CP - Invalid leght Fail00809 CP - Invalid index Fail0080A CP - Invalid offset Fail0080B CP - Invalid header pointer Fail0080C...

  • Page 147: Appendix 4 Glossary

    Appendix 4 Glossary µC Microcontroller ABACUS Analog to digital converter for a radio receiver. Analog to Digital A/D Converter A device that converts an instantaneous dc voltage level to a corresponding digital value. Also known as CODEC. ACELP Algebraic Code Excited Linear Prediction Automatic Gain Control Background Debug Mode Customer Programming Software...
  • Page 148 Glossary IMIC Integrated Memory Interface I & Q In-phase & Quadrature Liquid Crystal Device/Display Light Emitting Diode Local Oscillator Low-Pass Filter OOIC On-Off Interface Circuit Printed Circuit Board Phase Locked Loop. A circuit in which an oscillator is kept in phase with a reference, usually after passing through a reference divider.

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